HttpClientResponseException error body is sometimes null

[distinctdan]

Expected Behavior

In a unit test, my controller is returning a 400. I need to be able to read the error body to see why the request is failing, but HttpClientResponseException.response.body() is sometimes null. I've seen it work successfully once, but it's usually null, so this seems like a race condition or the body isn't being read correctly when the exception is generated.

Actual Behaviour

The error body shouldn't be null

Steps To Reproduce

val response = try {
    httpClient.toBlocking().retrieve(req, CursorResult::class.java)
} catch (e: HttpClientResponseException) {
    // body is null here
    LOG.error("HTTP error body: ${e.response.body()}")
    throw e
}

Environment Information

Micronaut version 4.7.4
Micronaut Platform version 4.4.5

Example Application

No response

Version

4.7.4

[ojebari-ma]

Hello, can you provide a full reproducible example please?

[distinctdan]

Unfortunately this isn't consistently reproducible. I've seen the same test sometimes have an error body, and sometimes it's null. I think we may need somebody to look at the body closing code and check for race conditions.